Is there any way to extract credentials saved by TortoiseSVN?
Based on the info below it sounds like you could possible decrypt them locally in some fashion...
UPDATE: Definitive answer from TortiseSVN community
When they're sent over the wire encrypted, they're encrypted using a handshake and/or agreed-upon key at the time of connection.
When they're stored/read locally, they're encrypted/decrypted via the Windows Crypto API which uses a key tied to your Windows account.
The locally-encrypted copy can't be decrypted by the server because the keys are local to your account.
So when you connect (let's say via HTTPS), your client gets the credentials decrypted via the appropriate Windows API, then includes them in the HTTPS transmission. HTTPS encrypts the whole communication between client & server using SSL certificates, not just the credentials.