EncryptURLParameter

recordid=ApexPages.currentPage().getParameters().get('CA_Info');
        if(recordid!=null && recordid!='')
        {
            if(recordid.contains(' '))
                recordid=recordid.replace(' ','+');
            Blob cryptoKey = Blob.valueOf('lmf456ert0123acf');
            Blob exampleIv = Blob.valueOf('0ydioopwur12IV12');
            Blob data = Encodingutil.base64Decode(String.valueOf(recordid));
            Blob decryptedData = Crypto.decrypt('AES128', cryptoKey , exampleIv, data);
            recordid= decryptedData.toString();
            System.debug('recordid ***' + recordid);
           	lstuserId = [SELECT Email,ProfileId,Username FROM User where id = :System.Label.Mirror_Credit_Guest_User limit 1];
            System.debug('Found user: '+lstuserId);
        }