I was looking into my Mail Server in Text version; There is saw an attachment of filename= xyz.xslx &
Content-Transfer-Encoding: base-64 and after that there was stream of Base64 encoded Code. Initially the content-type was
Now, Is it possible to convert the base-64 encoded string code to retrieve the xslx document? I tried using several online sites like
base64decode.org but as the initial file type was xslx, it didn't gave any output in Plain-Text too. So how do i work out with issue ?
This question already has an answer here:
I was implementing password hashing with salt, so I generated salt as binary, hashed the password, base64 encoded the password and salt then stored them into database.
Now when I am checking password, I am supposed to decode the salt back into binary data, use it to hash the supplied password, base64 encode the result and check if the result matches the one in database.
The problem is, I cannot find a method to decode the salt back into binary data. I encoded them using the Buffer.toString method but there doesn't seem to be reverse function.
I'm trying to decode a base64 multi-line file through the standard python library, however only the first line gets decoded, and the rest gets dumped for no reason.
Why is this?
The file before it gets encoded (what I'm trying to achieve after decoding):
VERSION: BenWin+ Version: 22.214.171.124[CR]
CREATED: 01 September 2016 12:56:27 PM[CR]
TIME CODE: 0x907e0, 0x10004, 0x38000c, 0x242001b[CR]
[CR] and [LF] are the character codes for Carriage Return (\r) and Line Feed (\n) respectively
I base64 encode the file using base64.b64encode and want to decode it later. Here is my code snippet.
encodedData = b'VkVSU0lPTjogQmVuV2luKyBWZXJzaW9uOiAzLjAuMTIuMQo=Cg==Q1JFQVRFRDogMDEgU2VwdGVtYmVyIDIwMTYgMTI6NTY6MjcgUE0KCg==VElNRSBDT0RFOiAweDkwN2UwLCAweDEwMDA0LCAweDM4MDAwYywgMHgyNDIwMDFiCg==Cg=='data = base64.b64decode(encodedData)print(data)
b'VERSION: BenWin+ Version: 126.96.36.199\n'
Thanks in advance.Using Python 3.5
I am using Angular1 with TypeScript. I have a simple question.
Is there any way to encode-decode a string in base64 with the environment, I use.?
I have searched a lot, I could find this. But I am not sure whether it is available with the Type-definition.
.Net's implementation of Convert.FromBase64String() can be fed an invalid input and will produce output without throwing a FormatException. Most invalid input is caught correctly but this type is not. In this case FromBase64String will ignore the last 4 bits of the input string. This can cause multiple inputs to decode to the same byte array.
The issue is demonstrated in this code:
var validBase64 = Convert.FromBase64String("TQ==");//assigned length 1 byte array with single byte 0x4dvar invalidBase64 = Convert.FromBase64String("TR==");//also assigned the samevar validConvertedBack = Convert.ToBase64String(validBase64);//assigned TQ==var invalidConvertedBack = Convert.ToBase64String(validBase64);//assigned TQ==
This occurs for the reason explained in this image:
The first 2 bytes of 'Q' (0,1) are used but the next 4 are ignored. Any character that starts with 0,1 will therefore decode to the same byte array such as R (0,1,0,0,0,1).
The Base64 encoding rfc does not define decoding, only encoding so .Net is not in violation of that spec. However the spec does warn that a similar issue is dangerous:
> The padding step in base 64 and base 32 encoding can, if improperly implemented, lead to non-significant alterations of the encoded data. For example, if the input is only one octet for a base 64 encoding, then all six bits of the first symbol are used, but only the first two bits of the next symbol are used. These pad bits MUST be set to zero by conforming encoders, which is described in the descriptions on padding below. If this property do not hold, there is no canonical representation of base-encoded data, and multiple base- encoded strings can be decoded to the same binary data. If this property (and others discussed in this document) holds, a canonical encoding is guaranteed.
Is Microsoft aware of this functionality? If not, could this be a security issue?